78638045467681 has 48 divisors (see below), whose sum is σ = 97304824013760. Its totient is φ = 63185233507200.

The previous prime is 78638045467673. The next prime is 78638045467721. The reversal of 78638045467681 is 18676454083687.

It is not a de Polignac number, because 78638045467681 - 2³ = 78638045467673 is a prime.

It is a super-2 number, since 2×78638045467681² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78638045477681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152731431 + ... + 153245443.

It is an arithmetic number, because the mean of its divisors is an integer number (2027183833620).

Almost surely, 2^{78638045467681} is an apocalyptic number.

It is an amenable number.

78638045467681 is a deficient number, since it is larger than the sum of its proper divisors (18666778546079).

78638045467681 is a wasteful number, since it uses less digits than its factorization.

78638045467681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515774 (or 515767 counting only the distinct ones).

The product of its (nonzero) digits is 1300561920, while the sum is 73.

The spelling of 78638045467681 in words is "seventy-eight trillion, six hundred thirty-eight billion, forty-five million, four hundred sixty-seven thousand, six hundred eighty-one".